雅砻江锦屏水电站工程区活动构造研究及地壳稳定性评价

STUDY OF ACTIVE TECTONICS AND EVALUATION OF CRUSTAL STABILITY IN ENGINEERING SITE AREA FOR JINPING HYDROPOWER STATION ON YALONGJIANG RIVER, CHINA

摘要: 北东向的锦屏山-小金河断裂带从北东到南西斜穿整个锦屏水电站工程区。在它的东南和西北分别有北北西走向的羊坪子-纸厂沟断层组和北西走向的前波、高牛场等断层。锦屏山-小金河断裂带的马山头-周家坪断层组、瓦科断层组和北西向前波断层等晚第四纪继续活动, 但活动强度很弱。工程区新构造运动以整体抬升为主, 兼水平滑移和旋转运动。历史至今, 工程区地震活动微弱, 是地壳相对稳定的地区。

Abstract: The NE trending Jingpingshan XiaoJinhe fault zone obliquely passes through the engineering site area for Jinping Hydropower Station from northeast to southwest. In the southeastern and northwestern parts of the area exist the NNW trending Yangpingzi Zhichanggou fault set and NW trending Qianbo and Gaoniuchang faults, respectively. During late Quaternary most of the faults in this region has become except the Mashantou Zhoujiaping and Wake faults of the Jinpingshan Xiaojinhe fault zone as well as the NW trending Qianbo fault, which were still weakly active at that time. The neotectonic movement in the engineering site area was dominated by the uplift of the whole region accompanied by horizontal displacement and rotation in historic and recent time. Therefore, the crust in the studied area is relatively stable.